Board of Governors of the Federal Reserve System (U.S.), 1935-. "Security Credit Reported, by Lenders Subject to Margin Regulations," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1970-1979," Annual Statistical Digest (March 1981) : 563-565. https://fraser.stlouisfed.org/title/7/item/23506/toc/190764 , accessed on April 24, 2024.